export default {
  // 为当前模块开启命名空间
  namespaced: true,

  // 模块的 state 数据
  state: () => ({
    // 购物车的数组，用来存储购物车中每个商品的信息对象
    // 每个商品的信息对象，都包含如下 6 个属性：
    // { goods_id, goods_name, goods_price, goods_count, goods_small_logo, goods_state }
    cart: JSON.parse(uni.getStorageSync('cart')|| '[]') ,
  }),

  // 模块的 mutations 方法
  mutations: {
    addGoods(state,goods) {
     const result = state.cart.find((item) => item.goods_id === goods.goods_id)
     if(result) {
       result.goods_count++
     }else{
       state.cart.push(goods)
     }
     console.log(state.cart);
     this.commit('m_cart/saveToStorage')
    },
    //持久化购物车cart数据
    saveToStorage(state){
      uni.setStorageSync('cart',JSON.stringify(state.cart))
    },
    // 更新商品选中状态
    updateGoodsState(state,goods){
      // console.log(state.cart);
      // console.log(goods.goods_id);
     const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
     // console.log(findResult);
     findResult.goods_state = goods.goods_state
     // const resultGoods = state.cart.find((x)=> x.goods_id ===goods.goods_id)
     this.commit('m_cart/saveToStorage')
    },
    // 更新商品数量
    upDateGoodsCount(state,goods){
     const findResult= state.cart.find(x => x.goods_id === goods.goods_id)
     if(findResult){
       findResult.goods_count = goods.goods_count
     }
     this.commit('m_cart/saveToStorage')
    },
    // 删除购物车数据
    removeGoodsByid(state,goods_id){
      state.cart = state.cart.filter(x => x.goods_id !== goods_id)
      this.commit('m_cart/saveToStorage')
    },
  // 实现全选反选
  updateAllGoodsState(state,newState){
    state.cart.forEach(x=> x.goods_state = newState)
     this.commit('m_cart/saveToStorage')
  }
  },

  // 模块的 getters 属性
  getters: {
    total(state){
      let c =0
      state.cart.forEach(item => c +=item.goods_count)
        return c
    },
    //购物车中选中商品的数量
    checkedCount(state){
     return state.cart.filter(x => x.goods_state).reduce((total,item)=>total +=item.goods_count ,0)
    },
    checkedPrice(state){
     return state.cart.filter(x => x.goods_state).reduce((total,item) => total += item.goods_count*item.goods_price ,0).toFixed(2)
    }
  },
}